I saw this one a little while ago Bebeth,love watching hacks
I have been looking for something to replace that stuff called crystal rain, I can't buy it for love nor money here anymore
It's for putting in the soil or potting mix just before planting and it is super absorbent, which is great as you don't have to water as often or worry about the plants dying if you go away for a few days..
Maybe this would work,it would depend if the plants could extract the water from them..
Time to experiment
I had in desperation considered buying some baby nappies and tearing one open.